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More Power! Get the details on the potent Porsche 911 GT3 RS 4.0

Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new, naturally aspirated 4.0-liter version of the company's sturdy, horizontally opposed flat six-cylinder engine. The unit kicks out 50 hp more than the 3.8-liter six-cylinder used in the existing 911 GT3 RS. This mill claims 500 hp at 8,250 rpm, a figure which makes the speedster the most powerful naturally aspirated road-going version of the 911 ever.

AMG Action! Mercedes eyes new naturally aspirated V8

Mercedes-Benz has selected the twin turbocharged 5.5-liter V8 engine to power the recently unveiled S63 AMG, CL63 AMG and CLS63 AMG, with ratings between 525 hp and 577 hp. But it's going to be a different story for the successor to the SLK55 AMG set to be revealed at next year's Frankfurt motor show. Sources within the Stuttgart headquarters suggest the new performance roadster is earmarked to receive a yet-to-be revealed naturally aspirated version of Mercedes-Benz's new 5.5-liter V8.

Cost of driving theory test to drop by 25%

Mercedes-Benz The government has announced that the cost of the driving theory test is to be cut by 25%, saving learner drivers in excess of £100 million over the next nine years. How much does the driving theory test cost? Under the new plans the cost of a car theory driving test will drop from £31 to £25 in October 2014, with a further drop of £2 more planned in October 2015.